Spark-aerestee



UNITED STATES PATENT OFFICE.

SAMUEL SWETT, JR., OF BOSTON, MASSACHUSETTS.

SPARK-ARRESTER.

Specificationof Letters Patent No. 4,715, dated August 26, 1846.

To all whom it may concern Be it known that I, SAMUEL SWETT, Jr., of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Apparatus for Arresting Sparks, which is described as follows, reference being had to the annexed drawings of the same, making part of this specification.

Figure l is a top view or plan. Fig. 2 is a vertical section at the line 00 m of Fig. 1. Fig. 3 is a vertical section at the line 0 0 of Fig. 1.

A represents the usual smoke pipe. B is an outside case that surrounds the smoke pipe A, commencing at the circular bottom plate B and gradually increasing in diameter to the top of the smoke pipe A forming an inverted hollow frustum. of a cone or funnel for confining the sparks having a smoke pipe passing through a circular col-- 'lar inserted into a round hole in the bottom of the heart shaped cap of a diameter a little greater than the diameter of the smoke pipe forming a space E between the pipe and collar large enough for the sparks to pass through said space into the case. The

edges of the heart are made solid and smooth for the purpose of turning the sparks to the right and left in a curved direction and then 40 downward toward the outside of the pipe as indicated by the arrows 1, 2, 3, 4, 5, 6. The sides of the heart shaped cap are closed with reticulated wire, or metallic gauze E of meshes small enough to arrest the small light sparks and at the same time allow the smoke to pass freely through to the upper or cylindrical end of the smoke pipe which is entirely uncovered as at B F is a concave circular partition plate secured to the inside of the case and surrounding the outside of the smoke pipe without touching it for guiding the sparks to the bottom of the case. The arrows 8, 4, 5, 6, indicate the direction that the sparks will take after leaving the topof the smoke pipe, and upper part of the cap.

G G are two pipes extending from the top of the case to the bottom of the concave plate F for ventilating the apparatus covered on top with wire gauze as at G G What I claim as my invention and desire to secure by Letters Patent, is-

Placing a heart shaped cap or bonnet E having solid edges and reticulated sides, in-' side the outer case B and over the upper part of the smoke pipe A, in the manner and for the purpose set forth, or other mode substantially the same, and for a like purpose.

SAMUEL SWE-TT, JR. Witnesses:

HENRY B. STANTON, JOEL P. BISHOP. 

